Coronary arteriography in complicated acute myocardial infarction; clinical and angiographic correlates

Transcription

1 Coronary arteriography in complicated acute myocardial ; clinical and angiographic correlates Luis M. de la Fuente, M.D. Buenos Aires, Argentina From January 1979 to June 30, 1979, we performed coronary arteriography in more than 350 patients with acute and subacute myocardial. The purpose of this paper is to study 301 patients with myocardial complicated in the acute and subacute period by (1) angina, (2) acute mitral regurgitation, (3) perforation of the interventricular septum, (4) ventricular fibrillation, (5) intractable recurrent ventricular tachycardia-fibrillation, (6) heart failure, and (7) cardiogenic shock (Table 1). The studies were performed within 6 hours to 30 days after acute and subacute myocardial and a few hours after the onset of complications. The coronary arteriograms were performed by the Sones technique without the aid of mechanical circulatory assistance, and there were no deaths associated with the studies. Acute and subacute myocardial was diagnosed by the clinical history, electrocardiogram, and serum enzyme levels. We consider only severe obstructions (>70% narrowing). Angina after acute and subacute myocardial Two hundred thirty-six patients had angina within 30 days of an acute and subacute myocardial 200

2 Fall 1980 Complicated acute myocardial 201 Table 1. Complicated acute and subacute myocardial ; severity of the obstruction in the artery responsible for the ; 301 patients Total obstruction Severe obstruction Angina after acute myocardial (64%) 85 (36%) Mitral insufficiency after acute myocardial infarc (80%) 3 (20%) tion Interventricular septal defect after acute myocar (66.3%) 6 (33.7%) dial Ventricular fibrillation 6 3 (50%) 3 (50%) Intractable recurrent ventricular tachycardia fi (80%) 3 (20%) brillation Heart failure 8 8 (100%) Cardiogenic shock 2 2 (100%) Table 2. Acute and subacute myocardial complicated by angina; 236 patients Acute 107 (45.4%) Transmural 215(91%) Subacute 129 (54.6%) Nontransmural 21 (9%) Electrocardiographic location of the acute and subacute myocardial by angiographic groups Group I II III IV VI Anteroseptal Anterior 33 Anterolateral Inferior 5 38 Posterior 4 9 Lateral Subendocardic anterior Subendocardic anterolateral _1 _5 _1 Total Group I II III IV V VI (Table 2). Usually the pain was severe, repetitive, and appeared at rest. We identify six different angiographic groups. 1 Group I. Severe obstruction of a coronary artery (>70%) without collateral circulation producing an area of smaller than the zone perfused by that artery, with a surrounding area of ischemia. The left ventriculogram shows an area of akinesia or hypokinesia smaller than the total zone irrigated by that artery. Group II. The same anatomy as that in group I, but in addition there are one or more severe obstructions in other coronary arteries. Group III. Total or subtotal obstruc-

3 202 Cleveland Clinic Quarterly Vol. 47, No. 3 tion of an artery that produces an smaller than the area irrigated by that artery because of collateral circulation to the affected zone. The artery that provides the collateral circulation as well as the remainder of the coronary arteries are free of severe obstructions. In many cases, the collateral circulation limits the extension of the, but is not sufficient to supply an adequate amount of oxygenated blood to the periinfarcted area that remains ischemic. The left ventriculogram shows a zone of hypokinesia or akinesia smaller than the total area perfused by the obstructed artery. Group IV. The same anatomical as in group III, associated with severe obstruction in another artery. If this artery is the one that provides the collateral circulation, the peri area is seriously jeopardized. Group V. Severe or total obstruction of a coronary artery, which produces an extensive (presumably corresponding to the total area perfused by that artery) associated with severe lesions in other coronary arteries. The ventriculogram shows an area of akinesia or dyskinesia corresponding to the area perfused by the obstructed artery. Group VI. Subtotal or total obstruction of an artery with development of a ventricular aneurysm associated with mild or moderate obstructive lesions. The genesis of the pain can be different for each group. In groups I and III, with severe lesions in a single vessel, the pain probably originates from ischemic tissue surrounding the infarcted area. In groups II and IV, the pain can arise either from the infarcted area or from another ischemic zone or both. In group V, the angina probably does not originate from the infarcted area, but from the ischemic regions produced by another artery. The angina in group VI has several possible causes. (1) Patch areas of ischemic tissue within the zone of the acute necrosis, (2) increased oxygen consumption (acute ventricular aneurysm), and (3) underestimation of the severity of the obstruction in the other arteries. Prognostic implications In groups I and II, complete obstruction of the involved vessel can produce the extension of the previous or a new. We believe that in group III, the collateral circulation tends to improve oxygen supply to the ischemic area with time. Some of these patients had normal ergometric tests several months after the acute episode. Patients in group IV have the high risk of a new and extension of the previous one if the artery that provides the collateral circulation became completely obstructed. In group V, the infarcted area is large and a new infarct will cause a severe left ventricular impairment. In group VI, the prognosis is closely related to the evolution of an acute left ventricular aneurysm. In groups III and VI, if the pain episodes are not associated with ventricular arrhythmias or pump failure, medical treatment is indicated. We believe that postacute myocardial angina is a distinct entity with characteristic clinical and angiographic and with a clear-cut indication for coronary arteriography. Mitral regurgitation postacute myocardial Severe mitral regurgitation usually is a catastrophic complication of acute and subacute myocardial, having an incidence of approximately 1%. 3 The mitral regurgitation is produced by rupture or dysfunction of a

4 Fall 1980 Complicated acute myocardial 203 papillary muscle. Papillary muscle dysfunction is more common than rupture and can produce mild to severe mitral regurgitation. 4 Electrocardiographic location of is inferior with rupture of the posterior papillary muscle and anterolateral muscle when the anteromedial muscle is affected. 5 The clinical and angiographic of 15 patients are listed in Table 3. Thirteen patients had multiple-vessel obstructive lesions. Two patients had single-vessel disease, the right coronary artery in one patient and circumflex in the other. Rupture or dysfunction of a papillary muscle occasionally can be produced by a single-vessel obstruction. Cardiac catheterization should be associated with coronary angiography because of the high incidence of multiplevessel disease in these patients. The studies should be performed in the acute phase to quantitate the hemodynamic Table 3. Mitral insufficiency after acute myocardial ; 15 patients* Clinical Left ventricular failure 11 Acute pulmonary edema 3 Cardiogenic shock 1 Electrocardiographic location of the acute myocardial Inferior wall 14 Anterior wall 1 Angiographic Multiple obstructions 13 2 vessels, RCA and Cx 1 3 vessels, (LMT, 2 patients) 12 Single obstruction 2 RCA 1 Cx 1 * Men, 13; women, 2. Mean age, 54 years; range 38 to 68 years. RCA = right coronary artery, Cx = artery, LMT = left main trunk. circumflex alterations, the mitral regurgitation, delineate the coronary anatomy and the abnormalities of the left ventricle. Interventricular septal defect postacute myocardial Rupture of the ventricular septum is a rare complication of acute and subacute myocardial. It occurs in only 0.5% to 1% of patients with transmural myocardial. 6 The superposition of a large left-to-right shunt upon acute and subacute myocardial is usually a catastrophic Table 4. Interventricular septal defect after acute myocardial ; 19 patients* Time between the acute and the rupture of the ventricular septum 24 hr 2 2 days 3 3 days 4 4 days 2 5 days 4 7 days 1 8 days 1 10 days 2 Clinical Congestive heart failure 7 Left ventricular failure 10 Cardiogenic shock 2 Electrocardiographic locations of the acute myocardial Inferior wall 11 Anterior wall 8 Angiographic Multiple obstructions 11 2 vessels 8 3 vessels 3 Single obstruction 8 RCA 4 ADA 4 Left ventricular aneurysm 11 Anteroapical 6 Diaphragmatic 5 * Men, 13; women, 6. Mean age, 60 years; range, 43 to 81 years. ADA = anterior descending artery.

5 204 Cleveland Clinic Quarterly Vol. 47, No. 3 event, and the frequent association of ventricular septal defect with acute ventricular aneurysm worsen the clinical and hemodynamic deterioration. Rupture is most frequently located in the lower portion of the septum. The defect is usually single and its size may vary from 1 mm to 4 cm. 7 Table 4 lists the clinical, electrocardiographic, and angiographic in 19 patients. Eleven patients had multiple-vessel lesions. Single-vessel disease was present in eight patients, and the right coronary artery and the anterior descending artery were responsible for the acute and subacute myocardial. These show that single obstruction of the right coronary artery or the anterior descending artery can occasionally produce perforation of the interventricular septum. If surgical treatment is considered, cardiac catheterization and coronary arteriography should be performed and concomitant coronary bypass and/or reconstruction of the left ventricle should be done if indicated. Acute myocardial complicated with primary ventricular fibrillation Ventricular flutter or fibrillation is the most critical cardiac arrhythmia that complicates acute and subacute myocardial. Its incidence is estimated to be about 10%. 8,9 Table 5 shows the angiographic in six patients with an acute myocardial complicated by an episode of primary ventricular fibrillation. Intractable recurrent primary ventricular tachycardia-fibrillation Primary recurrent ventricular tachycardia-fibrillation is one of the most serious complications of an acute myocardial. The prognosis is very Table 5. Acute myocardial complicated by ventricular fibrillation; 6 patients Anterolateral wall 2 Anterior wall 1 Anteroseptal wall 1 Inferior wall 2 Angiographic Multiple obstructions 3 2 vessels, ADA, RCA 2 3 vessels 1 Single obstruction 3 ADA 1 RCA 2 Table 6. Intractable recurrent primary ventricular tachycardia-fibrillation complicating acute and subacute myocardial ; 15 patients Appearance of arrhythmias in evolution of myocardial 1st week 2 2nd week 1 3rd week 2 4th week 10 Electrocardiographic location of the acute and subacute myocardial Anterolateral wall 4 Anterior wall 7 Inferior wall 3 Lateral wall 1 Arrhythmias present in these patients Patients No. % Ventricular premature contrac tions Ventricular tachycardia Ventricular fibrillation Ventricular flutter 2 13 Multiple obstruction 11 2 vessels: 3 patients 3 vessels: 8 patients Single obstruction, ADA 4 Acute anteroapical ventricular 8 aneurysm

6 Fall 1980 Complicated acute myocardial 205 Table 7. Heart failure; 8 patients Electrocardiographic location of acute myocardial Anterior wall 7 Inferior wall 1 Previous myocardial 5 Multiple obstruction 6 2 vessels 3 3 vessels 3 Single obstruction, ADA 2 Acute ventricular aneurysms 6 poor either with pharmacological or electrical measures. 10 Table 6 shows the clinical, electrocardiographic, and angiographic in 15 patients with this complication. Emergency coronary arteriography allows the detection of operable defects in many of these patients (coronary artery bypass or infarctectomy or both). Heart failure Table 7 shows the electrocardiographic and angiographic in eight patients with acute myocardial complicated by left ventricular failure. Coronary angiography is indicated in these patients to rule out a left ventric- Table 8. Cardiogenic shock; 2 patients Electrocardiographic location of acute myocardial Anterior wall 2 patients (All patients had a previous inferior wall myocardial ) ADA, 100% 1 patient, RCA, 95% Cx, 100% Multiple obstruction: ADA, 100% 1 patient, RCA, 100% Cx, 40% 2 patients ular aneurysm and to decide the adequate treatment. Cardiogenic shock Cardiogenic shock is one of the most serious complications of acute myocardial. Depression of cardiac performance in acute myocardial is directly related to extent of myocardial damage. Myocardial destruction in shock usually is over 40% of the left ventricular mass. 11 The left ventriculogram in these patients shows severe and diffuse dysynergy of the left ventricular myocardium Table 8 lists the electrocardiographic and angiographic in these patients.